616555501 has 2 divisors, whose sum is σ = 616555502. Its totient is φ = 616555500.

The previous prime is 616555493. The next prime is 616555547. The reversal of 616555501 is 105555616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555309225 + 61246276 = 23565^2 + 7826^2 .

It is a cyclic number.

It is not a de Polignac number, because 616555501 - 2³ = 616555493 is a prime.

It is a super-2 number, since 2×616555501² = 760281371626722002, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (616555601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308277750 + 308277751.

It is an arithmetic number, because the mean of its divisors is an integer number (308277751).

Almost surely, 2^616555501 is an apocalyptic number.

It is an amenable number.

616555501 is a deficient number, since it is larger than the sum of its proper divisors (1).

616555501 is an equidigital number, since it uses as much as digits as its factorization.

616555501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The square root of 616555501 is about 24830.5356567272. The cubic root of 616555501 is about 851.1198623584.

The spelling of 616555501 in words is "six hundred sixteen million, five hundred fifty-five thousand, five hundred one".